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Titolo:
Photocatalytic properties of iron porphyrins revisited in aqueous micellarenvironment: oxygenation of alkenes and reductive degradation of carbon tetrachloride
Autore:
Maldotti, A; Andreotti, L; Molinari, A; Varani, G; Cerichelli, G; Chiarini, M;
Indirizzi:
Univ Ferrara, CNR, Ctr Studio Fotoreatt & Catalisi, Dipartimento Chim, I-44100 Ferrara, Italy Univ Ferrara Ferrara Italy I-44100 rtimento Chim, I-44100 Ferrara, Italy Univ Aquila, Dipartimento Chim Ingn Chim & Mat, I-67010 Coppito, Italy Univ Aquila Coppito Italy I-67010 ngn Chim & Mat, I-67010 Coppito, Italy
Titolo Testata:
GREEN CHEMISTRY
fascicolo: 1, volume: 3, anno: 2001,
pagine: 42 - 46
SICI:
1463-9262(200102)3:1<42:PPOIPR>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
ONE-ELECTRON REDUCTION; IRON(III) PORPHYRINS; MOLECULAR-OXYGEN; COMPLEXES; OXIDATION; CYTOCHROME-P-450; CATALYSTS; METALLOPORPHYRINS; PHOTOCHEMISTRY; CLEAVAGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Maldotti, A Univ Ferrara, CNR, Ctr Studio Fotoreatt & Catalisi, Dipartimento Chim, ViaL Borsari 46, I-44100 Ferrara, Italy Univ Ferrara Via L Borsari46 Ferrara Italy I-44100 ra, Italy
Citazione:
A. Maldotti et al., "Photocatalytic properties of iron porphyrins revisited in aqueous micellarenvironment: oxygenation of alkenes and reductive degradation of carbon tetrachloride", GREEN CHEM, 3(1), 2001, pp. 42-46

Abstract

N,N-Dimethyltetradecylamine N-oxide (DTAO) is an appropriate surfactant toform micelles able to host the iron(III) meso-tetrakis(2,6-dichlorophenyl)porphyrin [Fe(III)(TDCPP)]. The so obtained microheterogeneous catalyst caninduce biomimetic redox processes on organic substrates in aqueous medium,using sunlight and oxygen as clean reagents. The primary photochemical process consists in the photoinduced reduction of Fe(III) to Fe(II) with the contemporaneous oxidation of the axial ligand to radical species. The micelle environment may control some main parameters affecting the reactivity of these intermediates and, therefore, the chemoselectivity of the hydrocarbonoxidation processes. In contrast to what is observed in homogeneous organic solution, both cyclohexene and cyclooctene can be oxidised to the corresponding epoxides, with a selectivity higher than 90% in the case of cyclooctene. On the other hand, the main oxidation product of cyclohexene is cyclohex-2-en-1-one as expected in a hydrophobic micellar environment. The Fe(III)(TDCPP)/DTAO photocatalyst is very promising also in view of obtaining catalytic systems capable of converting small amounts of toxic halogenated alkanes present in water into less dangerous products. In particular, CCl4 canbe reduced by ethanol or cyclohexanol with high quantum yields (> 10(-1)),with good conversion (ca. 75%) and turnover values (> 1500).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 19:43:35